from rest_framework import serializers

from goods.models import SKU
from .models import User
from django_redis import get_redis_connection
from .models import User
from django.core.mail import send_mail
from django.conf import settings
from celery_tasks.email.tasks import send_verify_url
from .models import Address
class RegisterUserSerializer(serializers.ModelSerializer):
    #write_only: 只写,只校验, 不入库, 也不需要返回到前端浏览
    password2 = serializers.CharField(min_length=8,max_length=20,label="确认密码",write_only=True)
    sms_code = serializers.CharField(min_length=6,max_length=6,label="短信验证码",write_only=True)
    allow = serializers.CharField(label="协议",write_only=True)
    token = serializers.CharField(label="jwt口令",read_only=True)
    class Meta:
        model = User
        fields = ("id","username","password","password2","mobile","sms_code","allow","token")

        read_only_fields = ("id",)

        extra_kwargs = {
            "password":{
                "min_length":8,
                "max_length":20,
                "write_only":True
            }
        }

    #1,单字段校验,allow协议
    def validate_allow(self, value):

        if value != 'true':
            raise serializers.ValidationError("必须同意协议")

        return value

    #2,校验多字段, 密码, 短信
    def validate(self, attrs):

        #0,取出手机号,和短信验证码
        sms_code = attrs["sms_code"]
        mobile = attrs["mobile"]

        #1,校验密码
        if attrs["password"] != attrs["password2"]:
            raise serializers.ValidationError("两次密码不相等")

        #2,校验短信
        redis_conn = get_redis_connection("code")
        redis_sms_code =  redis_conn.get("sms_code_%s"%mobile)

        #3,判断是否过期
        if not redis_sms_code:
            raise serializers.ValidationError("短信验证码已经过期")

        #4,校验正确性
        if sms_code != redis_sms_code.decode():
            raise serializers.ValidationError("短信验证码填写错误")

        #5,返回
        return attrs

    #3,由于User中没有password2,sms_code,allow,所以需要去除
    def create(self, validated_data):
        #1,去除不需要的数据
        del validated_data["password2"]
        del validated_data["sms_code"]
        del validated_data["allow"]

        #2,创建对象
        user = super(RegisterUserSerializer, self).create(validated_data)

        #2,1密码加密
        user.set_password(validated_data["password"])
        user.save()

        #设置JWT
        from rest_framework_jwt.settings import api_settings
        jwt_payload_handler = api_settings.JWT_PAYLOAD_HANDLER
        jwt_encode_handler = api_settings.JWT_ENCODE_HANDLER
        payload = jwt_payload_handler(user)
        token = jwt_encode_handler(payload)
        user.token = token

        #3,返回
        return user

class UserInfoSerializer(serializers.ModelSerializer):
    class Meta:
        model = User
        fields = ("id","username","mobile","email","email_active")

class EmailSendSerializer(serializers.Serializer):
    email = serializers.EmailField(label="邮箱")

    def update(self, instance, validated_data):
        #1,将邮箱设置到用户对象
        email = validated_data["email"]
        instance.email = email
        instance.save()

        #2,发送邮件
        verify_url = instance.generate_verify_url()
        # send_mail(subject="请你点击验证,来自美多国际商城", message=verify_url,
        #           from_email=settings.EMAIL_FROM,
        #           recipient_list=[email])
        send_verify_url.delay(verify_url,email)#使用celery发送

        #3,返回
        return validated_data

class AddressSerializer(serializers.ModelSerializer):

    province = serializers.StringRelatedField(read_only=True)
    city = serializers.StringRelatedField(read_only=True)
    district = serializers.StringRelatedField(read_only=True)
    province_id = serializers.IntegerField(label="省id")
    city_id = serializers.IntegerField(label="市id")
    district_id = serializers.IntegerField(label="区id")

    class Meta:
        model = Address
        exclude = ("user","is_deleted","create_time","update_time")


    #重写序列化器的create方法,目的为了补充user
    def create(self, validated_data):
        validated_data["user"] = self.context["request"].user
        return super(AddressSerializer, self).create(validated_data)

class AddressTitleSerializer(serializers.ModelSerializer):
    class Meta:
        model = Address
        fields = ("title",)

class UserBrowerHistorySerializer(serializers.Serializer):
    sku_id = serializers.IntegerField(min_value=1,label="商品编号")

    #1,单字段校验
    def validate_sku_id(self, value):
        #1,通过sku_id获取sku对象
        try:
            sku = SKU.objects.get(id=value)
        except Exception as e:
            raise serializers.ValidationError("商品不存在")

        #2,返回
        return value

    #2,重写create方法,需要保存记录到redis中
    def create(self, validated_data):
        #1,获取sku_id
        sku_id = validated_data.get("sku_id")
        user = self.context["request"].user

        #2,获取redis对象
        redis_conn = get_redis_connection("history")

        #3,去重
        redis_conn.lrem("history_%s"%user.id,0,sku_id)

        #4,存储
        redis_conn.lpush("history_%s"%user.id,sku_id)

        #5,截取5条
        redis_conn.ltrim("history_%s"%user.id,0,4)

        #6,返回
        return validated_data
